Lead-in construction for electric-discharge tubes



Aug. 20, 1929.

R. G. BERTHOLD F iled Oct. 23, 1926 LEAD-IN CONSTRUCTION FOR ELECTRIC DISCHARGE TUBES Patented Aug. 20, 1929.

UNITED STATES 1,725,115 PATENT OFFICE.

BUDOLI BERTHOLD, F BEBLIN-SIEMEN'SSTADT, GERMANY, ASSIGNOR TO SIEMENS- SCHUCKERTWERKE GESELLSCHAFT MIT BESGHRANKTER HAFTU'NG, OF BERLIN- S IEMENSSTADT, GERMANY, A CORPORATION OF GERMANY.

LEAD-IN CONSTRUCTION FOR ELECTRIC-DISCHARGE TUBES.

Application filed October 23, 1926, Serial No.143,632, and in Germany October 3, 1925.

My invention relates to a leading-in construction for electrodes disposed in vacuum discharged tubes or vacuum tubes which proposes to solve this problem in a particular simple and practical manner from the manufacturing standpoint.

- The particular object of my invention is to arrange the construction of the tube at the inlead portion such that the inlead elements may all be made alike in shape and so that their fusing into the tube may be accomplished in a-simple manner.

For this purpose I propose to shape these inleads as sheet metal rings bevelled at their 1 ends at which they are fused with the vessel wall, respectively with the insulating spacers. The arrangement is thereby made so that even the spacers may be made all alike in size and shape and similar to the metal rings so that only very few parts of different shape are thus required for the inlead construction which materially simplifies the manufacturing and reduces its cost.

All embodiment of my invention is illustrated in the drawing afiixed hereto. In

this drawing:

Fig. 1 is a longitudinal section through my improved electrode bushing or duct, and

Fig. 2, is a preferred manner of fixing the leads on a largei scale also in longitudinal section.

Referring to Figure 1 of the drawings, 1

is the wall of an electric discharge vessel consisting of glass or other fusible material suitable for this purpose, the vessel being provided with a tubular inverted socket or bushing 2 of similar material. According to my invention this bushing is interrupted by the annular terminals 3 and 4. These terminals consist of similar thin sheet metal rings bevelled at both ends and fused at these ends with the ends of the vessel socket and the .intermediate insulating rings 2 thus forming part of the bushing.

Each metal ring terminal consists preferably of thin sheet'metal, as already mentioned, so that sufiicient elasticity may be available when expansion takes place under the action of heat, whereby leakages at the joints, owing to cracking of the glass are avoided. I

The attachment to such a ring of the supply electrodes at the inside of the tube and of the supply leads at the outside usually presents considerable difiiculties I propose to solve this problem in the following simple manner.

Fig. 2 of the drawings illustrates an arrangement for attaching the leads in a very convenient manner. The sheet metal ring 3 which is contracted at about the middle of its length is firmly clamped or gripped be tween a strap 5 embracing the ring and a supporting member inside the ring. The strap is provided with a screw 6 for clampmg the ring and with whichthe inner electrode wire may also be connected. The supporting member inside the ring consists of two parts 7 and 8 forming together a bolster for the curved contraction in the middle of the ring. The two bolster halves 7 and 8 are preferably screwed together in order to permit their introduction into the interior of the ring and the tightening within it.

9 is the supplv lead which'may be screwed to i one of the bolster halves or fixed to it in any other suitable manner.

It will be readily understood that the two bolster portions could be drawn together by other means than by screwing them together, for instance by pushing them tightly together.

Various modifications and changes may be made without departing from the spirit and the scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art. y

I claim as my invention:

1. Means for establishing electric connection with a plurality of electrode leads disposed in a glass vacuum vessel, comprising a plurality of similar sheet metal rings forming part of the vessel wall and each being contracted at about the middle of its length, a metal strap for each ring embracing the outer periphery of the contracted ring portion and an inner supporting member for each ring consisting of two elements attachable to each other and forming a brace against the inner periphery of said contracted portion, the electrode lead being connected to the strap of the ring, the corresponding inner supporting member of the ring forming theoutside terminal for the pertaining lead.

2. Means for establishing electric connection with a plurality of electrode leads disposed in a glass vacuum vessel, comprising aplurality of similar sheet metal rings forming part of the vessel Wall and each being contracted at about the middle of its length,

a metal strap for each ring embracing the. outer periphery of the contracted ring portion and an inner supporting member for each rrngconsrstmg of two component elements, one being disposed at each end of the inner periphery of said contracted ringportion and following the contour thereof, and

means for drawing said component elements together to brace the ring against its outer strap, each electrode lead inside of the tube being connected to the strap of one of the rings and a detachable connection for each inner ring brace forming the outside .con-v nection for the pertaining electrode lead.

, In testimony whereof I afiix my signature. 4

RUDULF G. BERTHOLD. 

